From 48dd5ff2ee6fd3d32b7153af5ab4969a08c395d0 Mon Sep 17 00:00:00 2001 From: ruthgrace Date: Fri, 30 Oct 2015 23:22:33 -0400 Subject: [PATCH] fixed grammar in linux-bootstrap-2.md, Querying section --- Booting/linux-bootstrap-2.md | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/Booting/linux-bootstrap-2.md b/Booting/linux-bootstrap-2.md index 8a523ae..861cabe 100644 --- a/Booting/linux-bootstrap-2.md +++ b/Booting/linux-bootstrap-2.md @@ -472,7 +472,7 @@ Offset Size Description ) 13h 3 BYTEs "JPN" ``` -Next we call the `set_fs` routine and pass the value of the `es` register to it. Implementation of `set_fs` is pretty simple: +Next we call the `set_fs` routine and pass the value of the `es` register to it. The implementation of `set_fs` is pretty simple: ```c static inline void set_fs(u16 seg) @@ -483,15 +483,15 @@ static inline void set_fs(u16 seg) This function contains inline assembly which gets the value of the `seg` parameter and puts it into the `fs` register. There are many functions in [boot.h](https://github.com/torvalds/linux/blob/master/arch/x86/boot/boot.h) like `set_fs`, for example `set_gs`, `fs`, `gs` for reading a value in it etc... -At the end of `query_mca` it just copies the table which pointed to by `es:bx` to the `boot_params.sys_desc_table`. +At the end of `query_mca` it just copies the table pointed to by `es:bx` to the `boot_params.sys_desc_table`. The next step is getting [Intel SpeedStep](http://en.wikipedia.org/wiki/SpeedStep) information by calling the `query_ist` function. First of all it checks the CPU level and if it is correct, calls `0x15` for getting info and saves the result to `boot_params`. -The following [query_apm_bios](https://github.com/torvalds/linux/blob/master/arch/x86/boot/apm.c#L21) function gets [Advanced Power Management](http://en.wikipedia.org/wiki/Advanced_Power_Management) information from the BIOS. `query_apm_bios` calls the `0x15` BIOS interruption too, but with `ah` = `0x53` to check `APM` installation. After the `0x15` execution, `query_apm_bios` functions checks `PM` signature (it must be `0x504d`), carry flag (it must be 0 if `APM` supported) and value of the `cx` register (if it's 0x02, protected mode interface is supported). +The following [query_apm_bios](https://github.com/torvalds/linux/blob/master/arch/x86/boot/apm.c#L21) function gets [Advanced Power Management](http://en.wikipedia.org/wiki/Advanced_Power_Management) information from the BIOS. `query_apm_bios` calls the `0x15` BIOS interruption too, but with `ah` = `0x53` to check `APM` installation. After the `0x15` execution, `query_apm_bios` functions check the `PM` signature (it must be `0x504d`), carry flag (it must be 0 if `APM` supported) and value of the `cx` register (if it's 0x02, protected mode interface is supported). -Next it calls the `0x15` again, but with `ax = 0x5304` for disconnecting the `APM` interface and connecting the 32-bit protected mode interface. In the end it fills `boot_params.apm_bios_info` with values obtained from the BIOS. +Next it calls `0x15` again, but with `ax = 0x5304` for disconnecting the `APM` interface and connecting the 32-bit protected mode interface. In the end it fills `boot_params.apm_bios_info` with values obtained from the BIOS. -Note that `query_apm_bios` will be executed only if `CONFIG_APM` or `CONFIG_APM_MODULE` was set in configuration file: +Note that `query_apm_bios` will be executed only if `CONFIG_APM` or `CONFIG_APM_MODULE` was set in the configuration file: ```C #if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE) @@ -501,7 +501,7 @@ Note that `query_apm_bios` will be executed only if `CONFIG_APM` or `CONFIG_APM_ The last is the [`query_edd`](https://github.com/torvalds/linux/blob/master/arch/x86/boot/edd.c#L122) function, which queries `Enhanced Disk Drive` information from the BIOS. Let's look into the `query_edd` implementation. -First of all it reads the [edd](https://github.com/torvalds/linux/blob/master/Documentation/kernel-parameters.txt#L1023) option from kernel's command line and if it was set to `off` then `query_edd` just returns. +First of all it reads the [edd](https://github.com/torvalds/linux/blob/master/Documentation/kernel-parameters.txt#L1023) option from the kernel's command line and if it was set to `off` then `query_edd` just returns. If EDD is enabled, `query_edd` goes over BIOS-supported hard disks and queries EDD information in the following loop: